Mass Spectrometers

Mass spectrometers offer performance, versatility, and flexibility, sometimes exceeding that of GC. They are applicable for quantitative analysis of organic and inorganic compounds. A small vapor sample is drawn into the instrument through an inlet leak. A mass spectrometer works by ionizing a sample and then propelling the ions into a magnetic field. This field deflects each ion in proportion to its charge/mass ratio and causes it to strike one of a number of collectors. The signal from each collector is directly proportional to the concentration of ions having a particularly mass. Ahlstrom in the Instrument engineers' handbook provides a detailed description of quadruple mass-filter and multicollector, magnetic-sector instruments.

Typical instruments can sample multiple streams with a concentration of eight to twelve components in less than 5 sec. Depending on the vendor and applications, a variety of configurations are possible to maximize sensitivity and utility.

Wavelength (microns) 1.5 2.0

- CH Aromatic

- CH Aldehyde

- OH Water

- OH Alcohol

- OH Phenol

- NH2 Amine

Wavelength (microns) 1.5 2.0

12,500 10,000

7500 5000

Wave number (cm-1)

0 0

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